Ian,
Looks like the attach libxl patch is still not in the latest staging tree. 
Gianni has already acked it in the email below. Here is the patch description 
and sign off line in case you need it:
---
This patch checks to make sure the passthrough PCI device is owned by pciback 
driver.
Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
-----Original Message-----
From: Gianni Tedesco [mailto:gianni.tedesco@xxxxxxxxxx] 
Sent: Thursday, March 03, 2011 9:22 AM
To: Ian Jackson
Cc: Kay, Allen M; xen-devel@xxxxxxxxxxxxxxxxxxx; Stefano Stabellini
Subject: Re: [Xen-devel] RE: main_pcilist_assignable
On Thu, 2011年03月03日 at 17:10 +0000, Ian Jackson wrote:
> Kay, Allen M writes ("[Xen-devel] RE: main_pcilist_assignable"):
> > Attached patch makes sure the passthrough device belongs to pciback
> > before allow them passthrough to the guest. There are still many
> > other checks missing.
>
> Thanks for the patch. I see Stefano has already replied with some
> comments. We are now in code freeze and it may be better to leave
> this until 4.2 ?
FWIW, I wrote original faulty code and ack this as an obvious bug-fix.
Gianni

Attachment: libxl_pci.patch
Description: libxl_pci.patch

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